Preparation of waterborne inorganic intumescent fire retardant coating with silica sol

The invention discloses a water-based inorganic expansion type fireproof coating and a preparation method thereof, belonging to the field of coating preparation. The waterbased inorganic intumescent fireproof coating is asingle component. The coating is composed of the following raw materials in mass percentage: 15to40% of alkaline silica sol, 25to50% of potassium methyl silicate solution, 3to5% of titanium dioxide, 2to3% of talcum powder, mica Powder is 10‑20%, dolomite is 8‑15%, borax is 0‑2%, expandable graphite is 0‑3%, additives are 2.3‑3.8%. The paint of the invention has the advantages of environmental protection, good fire resistance, good expansion effect, good water resistance, and can be cured at room temperature, and is suitable for coating the surface of steel structures and is fireproof.